Resistance



J. J. MucHi-:R 2,146,509

RESISTANCE Filed Sep't. 2, 1936 ATTORNEYS Patented Feb. 7, 193? i UNITEDSTATES PATENT OFFICE 2,146,59 assisi-ANCE John J. Mueller, Brooklyn, N.Y.

Application September 2, i936, Serial No. 99,024

3 Claims. (Cl. bill-M64) This invention relates to a molded product orSmrounding the resistance and embedding the the like, and particularlyto an article of this same is an insulating jacket I4, which may, forcharacter in which high di-electric values are example, be formed of oneof the phenol resinoid desirable. products and which provides asubstantially air- It is an object of the invention to provide a proofand moisture-proof outer shell for said 5 molded product of, forexample, the electrical resistance. This jaclret may, in turn, be itselfresistance typel in which the resistance unit is encased in a metalcontainer such as has been encased in amoisture-proof container soinsulatindicated at I5, and which latter container is ed that little ifany leakage within the range of clamped about a mounting strip I6provided, for harmfui values Occurs. example, with end portions Il andI8 which 10 Another object is that of providing a structure areapertured to accommodate mounting screws. by means of which a pluralityof units may be As has been shown in Figs. 1 through 4, by using mountedin convenient form so as to lend theman elongated mounting strip IS anynumber of selves for unitary incorporation in the circuit resistanceunits may be joined together in one for which they were designed.continuous length and held in position by the 15 A further object isthat of providing a product intulried flange portions 0f 'the bodies I5.Likein' which the terminal members are provided with wise, as has beenindicated, end portions I9 may;

external support for the purpose of giving added if desired. be S'CrllkdOWn from the body I5 t0 rigidity t@ the same, said Supports functioningprovide additional separation between the parts. o0 at the same time asadditional insulating factors. .in this respect. DOII iS Called t0 theStruck 20 With these and otherr objects in mind, referrdown portions 2Uwhich Correspond to the porenc@ is had t0 the accompanying Sheet, ofdrawn. l'llOl'lS and are lOCatd at' the other end Of the ings in which:units. The provision of a metal armor or pro- Fig. 1 represents a planView oi' a preferred tective shell about the insulating material hasform of the invention; the desired characteristic of adding strength and25 Fig. 2 is a side elevation of the unit shown in PTOGCOH t0 h Somewhatbrittle iIiSula'ng Fig 1 partiaiiy broken away to Show internalmaterial, thus preventing an accidental shatterconstruction through thedotted lines 2w-2 oi ing OI fragmentation thereof.

Fig` i; Adjacent the points from which the terminal Fig. a is e. pianview of the bottom of the unit hosts l2 project. Shell I5 is providedwith aperso shown in Fig. l, again partiaiiy broken away i@ tures ofmaterially greater diameter than the disciose intemgi consti-muon;terminal posts themselves so that a substantial Fig 4 is an enlargedQIQSS-sectiongi View Laken Clearance GXSS at all pOlIltS between. theShell through the dotted lines 4 .4 of Fig 2' Showing i5 and terminalpost I2. In order to add to the a terminal member in position; rigidityof said terminal members and to provide 35 Fig. 5 is a fragmentary planView oi another additional insulating surfaces therefor, it is preformof unit and which is a modification of the ierled that projections 2l beprovided adjacent form of unit shown in Fig. 4; each terminal. These maybe formed of the Fig. 6 is a cross-section of the unit shown in Sametype of insulating material as forms the Fig. 5 taken along the dottedunes 5 5 of that body portion 14 and, as has been Shown in Fig- 4ofigure, and 4, may be additionally formed with step or set-off Fig. 7 isan enlarged cross-sectional view of DOTODS 22 23. the latter Preferablyincluding that unit taken through the dotted lines 1mi right angle edgeportions. 0f Fig, 6, By this expedient the insulating surface orReferring nonr to Figs. i through 4, there is areais increased, while atthe same time the 45 shown an electrical resistance of any well knownright angle step portions prevent accumulation type which, for example,may comprise a central of moisture or other undesirable substances coreI!! about which is wound a resistance wire which would be accompanied byelectri'c losses.

II and having spaced terminal members i2 It is to be understood that theinsulating proclamped about said resistance wire and core as jeotionssurrounding the terminal members may 50 at I3. If desired, theresistance may take the be utilized in connection with resistances, theform of carbon or any other suitable material body of which havecharacteristics other than and the terminals may be of a number and sothose heretofore described and that the type oi positioned as to meetthe requirements of any insulating material from which said projections5 particular situation. are formed may vary with the discretion of the55 user without in the least departing from the scope of the inventionas herein set forth.

Turning now to Figs. 5 through 7, there is shown a resistance unithaving a core 24 about which is wound resistance Wire 25, the latterbeing, in turn, embedded in an insulating jacket 26 enclosed in a metalshell 21. described in the disclosure of Figs. 1 through 4 and isclamped about a mounting strip 28. A terminal member 29 is provided andis secured to the resistance by means of clamping portions 30 andprojects through the outer metallic shell 21 through an aperture formedtherein. Surrounding said terminal member is an insulating projection 3lwhich in this instance has a convex outer surface and which may beformed of the same insulating material which comprises the jacket 2B orany other suitable material. The member 3|, as will be seen, extends fora substantial distance along the body of said terminal, lending rigidityand support thereto and at the same time increasing the insulatingsurface available between the outer shell and the terininal.

It will also be appreciated that as shown especially in Figs. 2, 4, 6and 7, the insulating material surrounding the terminals have baseportions preferably of an area larger than the openings through thecontainer or shell. In this manner it is' obvious that the structure-isnot alone further rigidified, but additionally a seal is formed suchthat the entrance of any foreign matter into the interior of the unit isprecluded.

It will be understood, as heretofore noted, that the invention hereindescribed may be practiced by utilizing multiple units, as shown inFigs, l through 4, or in individual units. The sole limitation on thenumber of units to be mounted on one mounting strip is the length of thelatter and the relative size of the units employed. Likewisc, themultiple mounting of resistances on a single strip may be practicedalone Without the use of the insulatingprojections hereinbefore referredto and as so utilized need notv employ any specific insulating materialor resistance element.

Thus, among others, the several objects of the invention' as aforenotedare achieved. It will be understood that numerous changes inconstruction and rearrangement of the parts might be resorted to withoutdeparting from the spirit of the invention as defined by the claims.

Having thus described the invention, what is 'I'his shell has beenclaimed as new and desired to be protected by Letters Patent is:

l. A resistance core, terminals extending therefrom, a metalliccontainer formed with openings of an area substantially larger than saidterminals and through which the latter are extended, a mass ofinsulating material enclosing said core and interposed between thelatter and said container, and portions forming a part of and integralwith said material mass and extending through the openings of saidcontainer and in intimate contact with said terminals to pointsmaterially beyond the adjacent face of the container, the bases of suchportions being of an area greater than such openings and engaging insealing contact such adjacent container face.

2. A resistance core, terminals extending therefrom, a metalliccontainer formed with openings of an area substantially larger than saidterminals and through which the latter are extended, a mass ofinsulating material enclosing said core and interposed between thelatter and said container, and portions forming a part of and inteingcontact such 3, A resistance from, a metallic of an area substantiallylarger than said terminals and through which the latter are extended, amass of insulating material enclosing said core and interposed betweenthe latter and said container, and portions forming a part of andintegral with said material mass and extending through the openings ofsaid container and in intimate contact with said terminals to pointsmaterially beyond the adjacent face of the container, said extendingportion presenting at points beyond said container a series ofsubstantially rectangular steps of increasing area in the direction ofsaid container, the bases of such portions being of an area greater thansuch openings and engaging in sealing contact such adjacent containerface.

adjacent container' face. core, terminals extending there- JOHN J.MUCHER.

container formed with openings f-

